Russia's foreign ministry has accused South Korea of blackmail and "threatening tactics" over its potential weapons supplies to Ukraine.
South Korea has provided non-lethal aid to Ukraine, including mine clearance equipment, but has so far resistsed Kyiv's requests for weapons.
The country said in June that it is revising this stance, however, in light of deepening cooperation between Russia and North Korea.
That has angered the Kremlin, with Russian foreign ministry spokesperson Maria Zakharova accusing South Korea of using "NATO narratives" to defend its potential arming of Ukraine.
She said: "We very much regret that Seoul's foreign policy uses NATO narratives, blackmail and threatening tactics, which is unacceptable to sovereign states."
